Fbank b



(No Model.)

F. B. WOOD.

CALL BOX.

110.317,912. Patented May 12, 1885,.

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'UNTTED STATES PATENT OFFICE.

FRANK B. VOOD, OF NEW YORK, N. Y., ASSIGNOR TO HENRY THAU 'AND EMANUEL BLEOO, BOTH OF SAME PLACE.

CALL-BOX.

SPECIFICATION forming part of Letters Patent NO. 317,912, dated Bday l2s 1885.

Application led November 523, 1883. (No model.)

To all whom t may concern:

Beit known that I, FRANK B. WOOD, a citizen of the United States, and a resident of the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Call-Boxes, of which the following is a specification.

My invention relates especially to boxes for holding the call mechanism employed by disio trict-telegraph companies, and has for its object the provision of a simple and cheap box wherein all danger from imperfect insulation of the circuit is overcome and the mechanism contained within the box protected from dust and dainpness. To attain this end my improved box consists of a receptacle constructed entirely of non-conducting material-such as articiallava -the back, sides or shell, and front of the box being made of said material and secured together in a simple manner, as hereinafter described and claimed; and my invention also involves certain other novel and useful combinations or arrangements of parts and peculiarities of construction and operation, all of which will be hereinafter first fully described, and then pointed out in the claims.

Call-boxes have heretoforebeen constructed of metal, and great expenditure of time and labor has been required to properly insulate the conductors of the circuit, and no matter how carefully done crosses would frequently occur, occasioning annoyance and delay. Again, where a metal box is employed contact is frequently made with a gas-burner, metal beams, or other-portions of the building wherein it is employed, causing a ground to take place.

In the drawings, Figure l is a front elevation of my improved box. Fig. 2 is a vertical central sectional view thereof at right angles to the face. Fig. 3 is a front elevation of a box when employed with a front instead of a back crank.

Like letters of reference, wherever they occur, indicate corresponding parts in all the figures. y

B is the back of the box, made of non-conducting material, and provided at its edge with a screw-thread, T, adapted and arranged to engage with a shell conducting material.

L are lugs formed upon the back and perforated for the passage of the screws used in securing the box to its support.

H is a crank-hole through the back.

The thread T and various lugs and perforations are formed upon the plate B while the same is molded, said plate and the other parts of the box coming out of the mold all ready to fit together, thus materially lessening the 6o cost of construction.

F is the front of the box, made of non-conducting material, secured in place by engaging with the thread T of the shell, said front being provided with a lug, A, for convenience in screwing the same into place, and with a hole, H, for use when front crank mechanism is employed.

G is a direction-card held in place between the front plate, F, and a rim, R, upon the 7o shell S.

When constructed and arranged in accordance with the foregoing, the portions of the box may be easily and cheaply molded of nonconducting material, and in assembling the 7 5 parts for use the card C is first placed in position, and the front plate, F, screwed home thereover. The back B is attached to its supporting-block, and the shell S screwed thereon, forming a. cheap, durable, and perfectly- 8o insulated box.

In the box shown iu Fig. l the crank D is placed at the back, the hole in the front being covered by the direction-card, and in Fig. 3 the crank is placed at the front, the call mech 85 auism covering the crank-hole in the back. The latter form of box may be provided with perforated cars E, for securing in place.

The advantages of my improved box may be summed up as follows: perfect insulation in 9o all its parts of the mechanism and circuit of the call; complete protection from dust and dampness. The direction-card may be quickly and easily changed, and is always sure to meet the eye of the user of the box.

When desired, the shell and front piece may be molded together, the directions being formed upon the front piece in raised or de- S, made also of non- 5o pressed letters; or the front may be made as shown and have the directions formed upon its surface.

Having now fully described my invention, what 1 claim as new therein, and desire to sesubstantially as shown a-nd described. cure by Letters Patent, is- Signed at New York, in the county of .New

1. A molded or pressed eall-box constructed York and State of New York, this 21st day of of non-conducting material and composed of November, A. D. 1883. a shell, S, provided Witha detachable back,B, FRANK B. YVOOD. having lugs L formed therewith, and a removable front plate, substantially as described.

2. A call-box the parts whereof are made of non-conducting material, and consist of a back, B, perforated at H, and bearing lugs L, shell S, having a rim, R, front plate, F, perforated at H, and card C, the whole arranged Witnesses A. M. PIERCE, WM. A. Lown. 

